Step 1: We perform a systematic search of multiple databases and use search engines to collect potential environmental evidence reviews. Searches are regularly updated.
Step 2: We use a set of eligibility criteria (see below) to screen potential reviews for inclusion in the CEEDER database.
Step 3: Eligible evidence reviews are randomly allocated to Review College members for rating. The members rate reliability of evidence reviews using CEESAT criteria (see below).

The CEESAT criteria were developed to critically appraise reviews in terms of transparency, repeatability and risk of bias. For each of 16 elements, a review is rated using four categories (Gold, Green, Amber, Red) of review methodology. The Gold equates to the top standard currently recognised in review conduct by CEE and Red is regarded as unreliable. When finding a review of relevance to your evidence needs you can either use the scores as a whole for judging the review reliability or look at certain elements that you feel are important for the context in which you are working. Although the categories are also given “scores” from 1-4, using total scores or mean scores to compare review reliability is not necessarily meaningful and we advise against this in any context except a crude “eyeballing”. It may be more important to understand what elements of a review score Red or Amber and therefore may be deficient.